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Extension springs - Information on selecting metal springs

InformationCompressionSpringSelection

Material

Patented drawn spring steel wire in compliance with EN 10270 part 1 type DH for all wire diameters up to 1.9 mm. For diameters between 2.0 and 10.0 mm type SH will be used (AMS 5112 / BS 5216-75). Our stainless steel springs are manufactured using spring steel wire material no.1.4310 in compliance with EN 10270 part 3 (AISI 302 / BS 301S21). The tolerances of the wire diameters comply with DIN 2076.

Design

The springs are right-hand coiled (clockwise).


right-hand coiled

A 1/1 German loop in compliance with DIN 2097 is fixed to each end of the spring.


1/1 German loop

Each of our extension springs is available with a choice of 2 different loop positions. One of the positions is 180 ° (indicated in the table by an catalogue number which ends with the letter "I".) In this case the loops are parallel, the loop ends are set at 180°(as in a right-hand screw).


loop position 180 degrees (I)

The other loop position is 270° (indicated by an catalogue number which ends with an "X") In this case the loops are positioned cross-wise. The loop ends have been turned through 270°.


loop position 270 degrees (X)

Loops are stocked without openings (m=0). However it is possible to have an opening cut into the loop at an extra cost, without causing any delay.

Surface treatment

Extension springs made of spring-steel wire EN 10270-1-DH and -SH will be ligthly oiled after the thermal coating. Springs made of material no. 1.4310 will not be re-coated after the thermal coating, as a surface protection is not normally required. All subsequent surface treatments cause unavoidable delay, as the application of a protective layer between the coils is very difficult due to the preset nature of the spring body. Here the selection of a suitable material should be made for an additional surface coating.

Use

Extension springs can be used with the stated deflections and loads by dead or infrequent strains. In all other cases an arithmetical check of the application of the spring should be carried out. It is crucial to check the stresses at the point of attachment of the loop to the body, as this is the critical point for possible fractures. A longer life-span can often be attained by choosing a different loop type.

Production compensation

In order to maintain the stated tolerated measurements we need to carry out production compensation with either the pre-stress (F0) or the wire diameter (d).

Quality control

Extension springs are tested for compliance to the tolerated loads and measurements before they are approved and reach the production warehouse. The tests take place in our quality control department according to DIN ISO 2859-1 level II. The procedure normally consists of a simple spot check programme, test-level AQL=1.0. Specific tests can also be carried out and documented for each individual spring upon the customer's request. The following charges apply for the quality control certificates issued by us.
In compilance with:
DIN EN 10204-2.1 (DIN 50049-2.1)
DIN EN 10204-2.2 (DIN 50049-2.2)
DIN EN 10204-2.3 (DIN 50049-2.3)
DIN EN 10204-3.1B (DIN 50049-3.1B)
Testing of prototypes

Calculation

The calculation and design of the extension springs is carried out in accordance with EN specification 13906, section 2. DIN 2097 Grade II is taken as the basic standard for the tolerances.

spring materials

Here you can see a selection of our normal spring materials, they we have on stock. In all questions to the right selection of spring material, please contact our Department Engineering:

Gutekunst Federn · Dep. Engineering · Gewerbegebiet · D-02733 Cunewalde
Tel. (+49) 035877/227-11 · Fax (+49) 035877/227-14 · technik@gutekunst-co.com

Designation, Material-description Max. operating temp. DIN EN France
(AFNOR)
GB
(BS)
Sweden
(SIS)
USA
(AISI)
EN 10270-1 type SH and DH
Spring steel wire
For all common springs
80°C17223-1 10270-1NFA 47-301-76BS 5216-75 *AMS 5112
1.4310 / X12CrNi177
Stainless steel V2A
High corrosion resistance
200°C1722410270-3Z12CN17.07301S212330302
EN 10270-2 / VDC (unalloyed)
Valve spring wire
In high dynamical stress
80°C17223-2 10270-2****
EN 10270-2 / VDSiCr (alloyed)
Valve spring wire
In high dynamical stress over
120°C17223-210270-2*2803 685A55HD*6150
EN 10270-2 / VDCrV (alloyed)
Valve spring wire
In high dynamical stress over
120°C17223-2 10270-2****
1.4301 / X5CrNi1810
Spring steel V2A
Corrosion resistance
250°C17440Z6CN18.09304S152332304
1.4401 / X5CrNiMo171-12-2
Spring steel V4A
Corrosion resistance, good relaxation, non-magnetic
300°C17224 10270-3Z6CND17.11316S312347316
1.4436 / X5CrNiMo17133
Spring steel V4A
Good corrosion resistance, slightly magnetic
300°C17440Z6CND17.12316S162343 316
1.4539 / X1NiCrMoCuN25-20-5
Spring steel V4A
For aggressive environments, non-magnetic
300°C1744010088Z1NCDU25.20*2562904 L
1.4568 / X7CrNiAI17-7
Spring steel V4A
Minimal relaxation, high dynamical stress
350°C1722410270-3Z8CNA17.07.01301S812388631
1.4571 / X6CrNiMoTi17-12-2
Spring steel V4A
Corrosion resistant, high strength
300°C1774010270-3Z6CNDT17.12320S312350316Ti
CW507L / CuZn36
Copper wire
Non-magnetic, salt-water proof
60°C1768212166****
CW452K / CuSn6
Bronze alloy
Non-magnetic, solderable, weldable, corrosion resistant
60°C1768212166****
CW101C / CuBe2
Copper beryllium
Corrosion resistant, anti-magnetic, non-sparking
80°C1768212166****
2.4610 / NiMo16Cr16Ti
Hastelloy C4
For very corrosive environments
450°C17744*3076 NA 45*5698 / 5699
2.4669 / NiCr15Fe7TiAI
Inconel X750
High temperature, non-magnetic
600°C17752*HR 505*AMS 5698
2.4632 / NiCr20CO18Ti
Nimonic 90
Resistant to most gas corrosion
500°C17754*BS 3075 (NA19)**
Duratherm / CoNiCrFe
Duratherm
High temperatures
600°C****


surface treatments

Here you can see a selection of our normal surface treatments, they we can produce for you in addition. In all questions to the right surface treatment, please contact our Department Engineering:

Surface treatmentAttributes
GalvanisedAnti-corrosion protection.
Galvanised with
polished finish
Visual surface coating, anti-corrosion protection.
Galvanised with
chromatic coating
Visual surface coating, anti-corrosion protection.
(colour blue, yellow, black, olive)
Nickel-platedVisual surface coating, anti-corrosion protection,
affordable frictionless characteristics.
Chrome-platedVisual surface coating, anti-corrosion protection.
PickledRemoved by chemically encased pollutants.
PassivatedSurface resistance due to oxide film, self repairing,
anti-corrosion protection.
Copper-platedGood conductivity, anti-corrosion protection.
BronzedVisual surface coating, smooth coloured surface,
reduced noncorrosive properties.
Electro-polishedSurface coating for stainless steel, visual finishing.
Mainly used for medical equipment.
Gold-platedVisual surface coating, conductivity, prevents excessive
arcing. Less mechanical and chemical resistance.
Teflon-coatingVery good frictionless characteristics.
Delta MagniVery high anti-corrosion protection, perfect for food.
Shot-peeningIncreased dynamic lifespan.
Plastic-powder-coatingVisual surface coating, the 180 different RAL colours are colour fast, sheen durability/RAL colour no.


Gutekunst Federn · Dep. Engineering · Carl-Zeiss-Strasse 15 · D-72555 Metzingen
Tel. +49 (0)7123 960-193 · Fax +49 (0)7123 960-150 · technik@gutekunst-co.com

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